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| Paleo-atmosphere | |
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| Tweet Topic Started: Aug 15 2015, 07:28 PM (802 Views) | |
| joe99 | Aug 15 2015, 07:28 PM Post #1 |
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Unicellular Organism
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well since the atmosphere of the carboniferous was different and if we brought back the animals would die due to the atmosphere but where is the line for a prehistoric organism too survive in todays atmosphere 6mya? 20mya? this is for a story im writing and I want it to be as accurate as possible |
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| Jinfengopteryx | Aug 15 2015, 07:48 PM Post #2 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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I don't know if you can draw such a line, but I hope this picture helps you in case you are interested in prehistoric oxygen levels:
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| J3st3r56 | Aug 16 2015, 06:06 AM Post #3 |
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Unicellular Organism
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Hm. I feel like animals that were pre-permian may struggle the most with today's atmosphere, but looking at the graph provided (thankyou Jinfengopteryx) it appears that Jurassic animals may be the most suited to today's atmosphere. (about 170 MYA to 120 MYA) which is curious because that is when animals were at their biggest overall. You would of thought that large animals means large amounts of oxygen for them, allowing higher growth rates, unless food was more abundant. I know I'm not particularly helping, but i like musing about these things. However, Carboniferous animals would not be able to breathe our atmosphere because of higher concentrations of co2 and methane and exponentially lower o2 levels.
Edited by J3st3r56, Aug 16 2015, 06:07 AM.
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| joe99 | Aug 16 2015, 09:27 AM Post #4 |
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Unicellular Organism
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thanks for that graph |
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| rocking1805 | Sep 20 2015, 05:36 PM Post #5 |
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Unicellular Organism
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Are you sure the graph is accurate? I've read an article recently and they told that according to the latest analysis Oxigen level appears to be lower in Cretacious than today (abot 17-18% against 21% for today). So it would mean that higher level of oxigen can no more stay a reason of why dinosaurs grew so big. |
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| theropod | Sep 20 2015, 08:00 PM Post #6 |
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palaeontology, open source and survival enthusiast
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And afaik they are not considered to be the reason in modern science. Sander et al. provide some discussion of this:
There appears to be some controversy, but little to suggest considerably higher oxygen levels during the mesozoic than today. Also of note is that extant whales are comparable in size to sauropods and that they can survive without problems, even with a (less efficient) mammalian respiratory system, and even well enough to hold their breath for hours in some cases. Sauropods could reach their gigantic sizes because their body plans, uniquely efficient feeding adaptions and reproductive strategy enabled them to do so, not because there was more oxygen at their time than there is today. I think while our atmosphere may require some getting used to for any extinct animal, most phanerozoic animals would be able to adjust to it, with the probably exception of the carboniferous, especially the large terrestrial arthropods. Sander, P. Martin; Christian, Andreas; Clauss, Marcus; Fechner, Regina; Gee, Carole T.; Griebeler, Eva-Maria; Gunga, Hanns-Christian; Hummel, Jürgen; Mallison, Heinrich; Perry, Steven F.; Preuschoft, Holger; Rauhut, Oliver W. M.; Remes, Kristian; Tütken, Thomas; Wings, Oliver; Witzel, Ulrich (2011) Biology of the sauropod dinosaurs: the evolution of gigantism. Biological Reviews, 86 (1), pp. 117-155. Edited by theropod, Sep 20 2015, 08:04 PM.
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